Did you punch out the punch out in the garbage disposer? The garbage disposer looks like it has an opening where the dishwasher would drain, but if the opening isn't clear, then the force drained (pumped) water is backing up as it is being dumped into the disposer. Did you install the anti-siphon?

: I recently installed a new GE dishwasher as I remodeled my kitchen. I used the punch-out in the sink to install a soap dispenser, so I bored a hole in the countertop right next to the sink for my air gap. As the dishwasher goes through it's cycles, a few cups of water spray from the air gap onto my countertop each time it drains. What is the cause for this, and how can I remedy the situation.